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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a27f642aa59c172345c0395eb724acf0cdf5e60a63808514a7d10b9c415d3e' 
  AND token = 'ZS+Xs5QDToLxNF7z+lLfJUkdPqyZ1A0gnmY+wRJmq1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}